Castillo Algaba, M. D., Verdaguer Clavera, i., Celaya Villanueva, M. L., Tragant Mestre, E., Padrós Masuet, M., González Davies, M., & Guardia Massó, P. (1994). Hands on C level, english workshops: Guía didáctica. Bruño.
Čikaški stil citiranja (17. izdanje)Castillo Algaba, María Dolores, isabel Verdaguer Clavera, María Luz Celaya Villanueva, Elsa Tragant Mestre, Miriam Padrós Masuet, Maria González Davies, i Pedro Guardia Massó. Hands on C Level, English Workshops: Guía Didáctica. Madrid: Bruño, 1994.
MLA način citiranja (9. izdanje)Castillo Algaba, María Dolores, et al. Hands on C Level, English Workshops: Guía Didáctica. Bruño, 1994.
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